Lack of true 3D feel to a shot making solid objects look like as if they are made from cardboard cutouts, i.e. they have no depth. This is also referred to as Cutout Planar Effect. Caused by inadequate depth resolution due to an incorrect matching between the focal length of the recording lens (or CGI camera) and the interocular distance between the cameras. Typically big zooms looking at distant objects can cause the effect if the left and right cameras are not sufficiently far apart.
See also: Interocular